IT'S EASY to watch the NBC comedy "Powerless," which premiered Thursday, and be reminded in one respect of Mary Tyler Moore. I genuinely hope that going forward, the writers behind "Powerless" - in order to improve their promising series - will remember her, too.

That's because in the days after Moore died last month, one clip from "The Mary Tyler Moore Show" that often got replayed was that well-known scene from the series premiere, in which bulldog of a newsman Lou Grant say